But I fear the whole mirror box assembly will be at least a couple hundred. From the information in the parts catalog, it can only be ordered along with a complete mirror box assembly (!) It looks like a 20$ or so part, it only has 10 components and two ribbon connectors on it. To make matters worse, one of the PCB's that are so severely damages that replacement is needed is the Front flex PCB, which has not part number on it's own, that is if I am reading the parts catalog correctly. None of these points have any attempt at water sealing - You can mount a L-series lens with weather sealing and that should prevent water from entering the mirror box, but what good is it if water can enter from almost anywhere else ? In mine, water had crept in at the right hand strap hook (which faces upwards, doh!), IR receiver port on front, around lens mount (not into mirror box, but between front cover and lens mount). I confirm Pete's observation that there are no o'rings or other attempt at water sealing at any of the cover spitlines. Canon consumer cameras, such as your 550D, use the E3 connector that is basically the same as the end of a 2.5mm stereo headphone cable. Any remote from Canon or a third party with an N3 connector should work with your 5D Mark III. Most Canon pro cameras use this connector as well. Upon opening it, I found salt water damage in from several places. The EOS 5D Mark III uses the N3 connector. ![]() ![]() Canon returned it to me "uneconomical to repair" which surprised me because it didn't really get splashed that much, and canon does market it as water resistant. I have a 5D Mk2 that I ended up needing to open after a whalewatching trip.
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